Definition of sheath in English:


Syllabification: sheath
Pronunciation: /SHēTH

noun (plural sheaths /SHēT͟Hz, SHēTHs/)

  • 1A close-fitting cover for something, especially something that is elongated in shape, in particular.
  • 1.1A cover for the blade of a knife or sword.
    More example sentences
    • Drawing the sword free of the sheath she inspected the blade.
    • Shaking his head at the stupidity of his thoughts, he pulled the sword from its sheath and swung the blade experimentally.
    • The anger was beginning to show as he took his sword from its sheath and positioned the blade so that it was at the guard's neck.
    scabbard, case
  • 1.2A structure in living tissue that closely envelops another: the fatty sheath around nerve fibers
    More example sentences
    • The tumor infiltrated perineural sheaths and peripancreatic fatty tissue.
    • The median nerve and the tendon of palmaris profundus are ensheathed in a common sheath of connective tissue.
    • It is the breakdown of the synovial tissue of tendon sheaths that gives rise to most ganglia.
  • 1.3 (also sheath dress) A woman’s close-fitting dress: a tight sheath of black and gold lurex
    More example sentences
    • Then, there's that generation who never wore anything more formal than a black sheath dress with a knit cardigan.
    • The skinny adolescent is dressed to kill in a black sheath dress, gloves and a straw pillbox hat with a veil.
    • A simple sheath dress or suit with gorgeous shoes and accessories can also save you from maxing out a credit card for a one night only outfit and be appropriate too.
  • 1.4A protective covering around an electric cable.
    More example sentences
    • Films of silica act like the plastic sheath on copper cable, since silica is insulating.
    • Installation is a breeze, and they even provide you with enough in the way of sheaths to keep your cables tidy if you need to.
    • The linear symmetry of the gold-colored cable sheaths was especially important.
  • 1.5A condom.
    More example sentences
    • This bill aims to take away the criminalised aspect of that, and it de-penalises the aspect of having evidence of safe sex on the premises - that is, condoms, sheaths, diaphragms, and lubricants.
    • The condom, or male sheath, was quite a late development.
    • Protective and decorative penis sheaths were common among primitive societies.



More example sentences
  • Such a floppy, sheathless notochord cannot push effectively on the surrounding embryonic tissues, but rather folds up like a wet noodle as it elongates relative to the surrounding embryo.
  • We developed a new sheathless technique for percutaneous intraaortic balloon catheter insertion which reduces the effective catheter diameter.
  • A variety of tip shapes and conducting coatings were evaluated using an electrospray time-of-flight mass spectrometer run in the sheathless mode.


Old English scǣth, scēath 'scabbard', of Germanic origin; related to Dutch schede, German Scheide, also to the verb shed2.

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